Siemens SICAM P30, SICAM P31, SICAM P32, SICAM P20, SICAM P21 User Manual

SICAM P30

Preface

Content

Overview 1

SICAM P31

SICAM P32

3-phase Current Power
Meter

V1.0

Manual

Technical Data 2
Functions 3
Operation and Display 4
Installation and Wiring 5
Communication 6
Maintenance 7
Ordering Number 8

E50417-H8940-C561-

NOTE

For your own safety, observe the warnings and safety instructions contained in this document, if available.

Disclaimer of Liability

This document has been subjected to rigorous technical review
before being published. It is revised at regular intervals, and any
modifications and amendments are included in the subsequent
issues. The content of this document has been compiled for
information purposes only. Although Siemens AG has made best
efforts to keep the document as precise and up-to-date as possible,
Siemens AG shall not assume any liability for defects and damage
which result through use of the information contained herein.

This content does not form part of a contract or of business
relations; nor does it change these. All obligations of Siemens AG
are stated in the relevant contractual agreements.

Siemens AG reserves the right to revise this document from time to
time.

Copyright

Copyright © Siemens AG 2015. All rights reserved.

The disclosure, duplication, distribution and editing of this docu­ment, or utilization and communication of the content are not per­mitted, unless authorized in writing. All rights, including rights
created by patent grant or registration of a utility model or a design,
are reserved.

Registered Trademarks

SIPROTEC®, DIGSI®, SIGUARD®, SIMEAS®, and SICAM® are
registered trademarks of Siemens AG. Any unauthorized use is
illegal. All other designations in this document can be trademarks
whose use by third parties for their own purposes can infringe the
rights of the owner.

Document Version: V01.10.01

Release date:



Siemens Power Automation Ltd. Order No.: E50417-H8940-C561-

Preface

Purpose of this manual

This manual describes the functions, operation, installation, and commissioning of devices 3-phase Current
Power Meter-> In particular, one will find:

• Information regarding the configuration of the scope of the device and a description of the device functions
> Chapter 3;

• Instructions for Operation and Display > Chapter 4;

• Technical Data > Chapter 2;

T arget Audience

Protection engineers, commissioning engineers, personnel concerned with adjustment, checking, and service

of selective protective equipment, automatic and control facilities, and personnel of electrical facilities and
power plants.

Additional Support

Should further information on the System SICAM be desired or should particular problems arise which are not
covered sufficiently for the purchaser's purpose, the matter should be referred to the local Siemens represen­tative.

Our Customer Support Center provides a 24-hour service.

Phone: [phone]

Fax: [phone]

E-mail: [email protected]

Notes on Safety

This document is not a complete index of all safety measures required for operation of the equipment
(module or device). However, it comprises important information that must be followed for personal safety, as
well as to avoid material damage. Information is highlighted and illustrated as follows according to the degree
of danger:

DANGER

DANGER means that death or severe injury will result if the measures specified are not taken.

✧ Comply with all instructions, in order to avoid death or severe injuries.

WARNING

WARNING means that death or severe injury may result if the measures specified are not taken.

✧ Comply with all instructions, in order to avoid death or severe injuries.

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Preface

CAUTION

CAUTION means that medium-severe or slight injuries can occur if the specified measures are not taken.

✧ Comply with all instructions, in order to avoid moderate or minor injuries.

NOTICE
NOTICE means that property damage can result if the measures specified are not taken.

✧ Comply with all instructions, in order to avoid property damage.

NOTE

Important information about the product, product handling or a certain section of the documentation which
must be given particular attention.

Qualified Electrical Engineering Personnel

Only qualified electrical engineering personnel may commission and operate the equipment (module, device)
described in this document. Qualified electrical engineering personnel in the sense of this manual are people
who can demonstrate technical qualifications as electrical technicians. These persons may commission,
isolate, ground and label devices, systems and circuits according to the standards of safety engineering.

Proper Use

The equipment (device, module) may be used only for such applications as set out in the catalogs and the
technical description, and only in combination with third-party equipment recommended and approved by
Siemens.
Problem-free and safe operation of the product depends on the following:

• Proper transport

• Proper storage, setup and installation

• Proper operation and maintenance

When electrical equipment is operated, hazardous voltages are inevitably present in certain parts. If proper
action is not taken, death, severe injury or property damage can result:

• The equipment must be grounded at the grounding terminal before any connections are made.

• All circuit components connected to the power supply may be subject to dangerous voltage.

• Hazardous voltages may be present in equipment even after the supply voltage has been disconnected
(capacitors can still be charged).

• Operation of equipment with exposed current-transformer circuits is prohibited. Before disconnecting the
equipment, ensure that the current-transformer circuits are short-circuited.

• The limiting values stated in the document must not be exceeded. This must also be considered during
testing and commissioning.

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Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2.1 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.1 Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.2 Limit violation alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.3 Display and Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.4 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.5 Permission and Security Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.6 Digital Input and Output Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

4 Operation and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

4.1 Full-screen Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2 Cyclic Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

4.3 Key Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

5 Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

5.1 Overall Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.2 Precautions of Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

5.3 Terminals and Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

6 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

6.1 Use of Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.2 Introduction of MODBUS-RTU Communication Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6.2.2 Function of Application Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

6.2.3 CRC Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

6.2.4 Information mapping table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

7.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

8 Ordering Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

8.1 Ordering Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

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Contents

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Overview 1

1.1 Introduction 8

1.2 Features 8

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Overview

1.1 Introduction

1.1 Introduction

SICAM P30, P31 and P32 3-phase electronic current monitoring instruments are designed for measuring 3­phase current of power grid. Large-screen LCD is used. Data acquisition through RS485 is available.

MODBUS-RTU communication protocol is supported via RS485 Serial communication port.

This product is extensively applicable to power substation and distribution automation system, industrial control
and industrial automation system, energy management system and community power monitoring, etc.

1.2 Features

This product uses high-precision sampling and metering unit and high-speed MCU data processing unit, sup­porting high-precision, wide-range and accurate measurement and quick data analysis; segmented multi-line
WVA LCD, realizing various and abundant display; white backlight for LCD, satisfying the need for viewing data
in dark environment; supporting long-time data storage without data loss even in the event of power failure with
NVRAM memory; RS485 communication port and industrial standard communication protocols, realizing flex­ible and reliable communication.

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Technical Data 2

2.1 Technical Data 10

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Technical Data

2.1 Technical Data

2.1 Technical Data

Item Technical Data

Product standard IEC61557-12:2007

Input connection 3 phase, single phase

Measurement

Current

Digital signal

Binary output (optional)

Binary input (optional)

Communication

Rated current In: 1 A, 5 A

Measuring range: 0.015 A ... 6 A

Maximum measuring range: 9 A

Power consumption: < 0. VA (VLQJOHSKDVH#$)

Accuracy: RMS 0.2%

Resolution: 0.001 A

Frequency: 45 Hz ... 65 Hz

2 electromagnetic relay output

Normal Open Contact

Contact capacity: AC 250 V /3 A, DC 30 V /3 A

4 dry contact inputs

Opto-coupler isolation, 4,000 V

RMS

Interface type: Twisted Pair, Half Duplex Transmission

RS-485 port (optional)

Communication rate: 600 bps ... 38,400 bps

Protocol: Modbus-RTU

Environment

Operating temp. -25 ℃ ... +60 ℃

Operating temp. limit -35 ℃ ... +70 ℃

Relative humidity ≤ 95% (condensation free)

AC or DC

Power supply

Others

Max. input range: 40 V ... 420 V

Power consumption: ≤  W,  VA

Overall dimension (mm): 96×96×95

Dimension

Panel cut out size (mm): 92×92

IP53

Weight Approx. 450 g

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Functions 3

3.1 Measurement 12

3.2 Limit violation alarm 12

3.3 Display and Buttons 13

3.4 Communication 13

3.5 Permission and Security Management 13

3.6 Digital Input and Output Interface 14

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Functions

3.1 Measurement

3.1 Measurement

This product can be used to measure current of each phase, average current and neutral current.

3.2 Limit violation alarm

1. This product is provided with limit violation alarm function. User may parameterize up to 6 limit value groups

from current parameters. In every limit value group, user can monitor that measured current values do not
exceed or fall short of a pre-definable measured value and relevant alarm will be activated. This product has
2 electronic relays contacts for 2 binary outputs, here user can output the limit value group signal via the
binary outputs when alarm parameters are configured with automatic mode (not manual), alarm signal can
be output via relay output(relay closing).

2. Up to 6 limit value group alarm can be parameterized. Configuration flow of each limit value group alarm:

select type of source-set threshold-set judgment condition-select output relay for alarm signal.

• Code of various detected data: (hexadecimal number for Modbus-RTU)

MODBUS Content of data

0F Phase A current

10 Phase B current

11 Phase C current

12 Neutral current

When detected data is FF, limit value group alarm function is disabled.

• Threshold of detected data: threshold judging whether detected value is out of limit; different units for dif-

ferent types of data, such as current-A.

• Judging condition: 0 means alarm activated when exceeding limit; 1 means alarm activated when falling

below limit.

• Alarm signal output relay: 0 means no alarm signal output; 1 means alarm signal output from relay 1; 2

means alarm signal output from relay 2; 3 means alarm signal output from relay 1 and relay 2 at the same
time.

3. Example of alarm parameter setting. Set one limit violation alarm parameter to automatic detection and alarm

for "Phase A current", assuming that alarm threshold is 6 A, judging criterion is "over limit” and signal is
outputted from relay 2.

Use MODBUS RTU protocol to set alarm parameter: set 0110 address to "0F", 0111 address to "0000", 0112

address to "0258" (multiply "6" by 100 to generate "600" and convert it into hex "00000258"), 0113 address
to "00" and 0114 address to "02".

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3.3 Display and Buttons

This product uses large-screen WVA multi-line LCD to provide visual and various display. The screen is pro­vided with white backlight, enabling clear display in dark environment. Specific data information can be ob­tained through display with button operation. For details, see Chapter Operation and Display.

3.4 Communication

RS485 communication port is provided for parameter setting and reading of various data. For specific
description, see Chapter Communication.

3.5 Permission and Security Management

1. This product is provided with programming permission management function. Three-level password protec­tion is applied:

• L0 password: used for setting all parameters and modifying L0, L2 and L4 passwords;

• L2 password: used for setting all parameters and modifying L2 and L4 passwords;

• L4 password: used for parameter setting and modifying L4 password, not for clearing extreme values and
PT/CT ratio setting.

• All level default PASSWORD is "000000"

2. Parameter setting is available only when this product is in programmable mode. Steps for entering

programming mode: press " " and " " at the same time to enter "PASS" screen; input correct
password and press " " to enter "SET" screen and enable programmable mode. After entering
programmable mode, programmable mode status indicator appears on the bottom right corner of LCD.
Programmable mode will remain valid in 10 minutes after program button is pressed and become invalid after
power down.

3. If incorrect password is used to set this product continuously (including communication setting and button

programming) up to specific number of times (factory default 5 times), parameter setting function will be
locked (factory default 60 minutes). Error count will be reset after setting once using correct password if such
count is less than specific limit. Error count of password and lock time can be set (available in factory state)

Functions

3.3 Display and Buttons

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Functions

3.6 Digital Input and Output Interface

3.6 Digital Input and Output Interface

Binary Input Interface

This product is provided with 4 binary inputs interface based on passive dry contact. Terminals are identified as
DI1, DI2, DI3, DI4 and COM. COM is the common terminal.

Figure 3-1 Circuit Diagram of Binary Input Interface

Relay Output Interface

This product is provided with two relay output interfaces for alarm indication or protection control output in many
conditions. Electric parameter of internal relay: AC 250 V/DC30 V, 3 A.

14

Figure 3-2 Circuit Diagram of Relay Output Interface

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Operation and Display 4

4.1 Full-screen Display 16

4.2 Cyclic Display 16

4.3 Key Definition 17

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Operation and Display

4.1 Full-screen Display

4.1 Full-screen Display

Figure 4-1 Description of LCD Indication

4.2 Cyclic Display

Key Functions at Cyclic Display Mode

Key symbol ▲▼

Function

Screen Lock in Cyclic Display State

Data in display area A or B can be locked in cyclic display state to enable long-time monitoring of data in certain
area.

Steps: press " ", select the desired display area (target data will blink thrice), and press " " to lock, and
vice versa for unlocking.

Cyclic Display Parameter

Duration: 1 to 99 sec., configurable;

Number of items: to be defined with one byte. 4 high bits are number of items in display area A while 4 low bits
are number of items in display area B. 16 items are acceptable to each area. At any time, display area A and
display area B should have at least one cyclic display item (only area A cyclic display item for this product).

Cyclic Display Data

Cyclic display data in area A can be defined by user. User may define cyclic display scheme previously through
inquiring "Code list of optional settings in area A".

Switching from cyclic display to

buttom display

Lock/unlock blinking

display

Switching between display

areas A and B (blinking

prompt)

16

Code list of optional settings in area A:

Data item Data type (current value)

Transient Maximun Minimum

Current 6 7 8

Neutral current 9 10 11

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Note

In flip-with-key state or parameter-set-with-key state, this product will automatically return to cyclic display state
if no key operation within defined duration.

4.3 Key Definition

Key Functions at Flip-With-Key Display Mode

Key symbol ▲▼

Operation and Display

4.3 Key Definition

1) Switch from cyclic display state
to key display state through press-

Function

ing "▲" or "▼".

2) Flip over to previous screen with
"▲" and to next screen with "▼".

Data Item of Key Display

No. Display content (1st level) Display content (2

1 Current Extreme value

2 Neutral current Extreme value

3CT ratio /

4 Version number /

5 Device ID /

6 Error code /

Examples for Flip-With-Key Operation

1) Switch between A (multi-

Enter next menu

line) and B (single line) display
areas

2) Return to previous menu

nd

level)

Example 1:

This screen shows current items.

At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to current items.

In the figure, L1=1.000 A, L2=1.001 A, L3=1.002 A and 3­phase average current=1.001 A.

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"RS1" shows there is one RS485 port and blinking symbol in­dicate communication in progress.

Example 2:

This screen shows Neutral current items.

At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to Neutral current
items.

In the figure, L1=0.940 A, L2=1.003 A, L3=1.006 A and
Neutral current=0.079 A.

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Operation and Display

4.3 Key Definition

Example 3:

This screen shows maximum value display items of phase
current.

At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to phase current

display items. Press " " to enter maximum value display.
In the figure, L1=1.020 A, L2=1.031 A, L3=1.032 A and
maximum value of average phase current =1.027 A. Press
"▲" or "▼" to switch to minimum value display of phase
current and press " " to return to previous display.

Example 4:

This screen shows CT ratio display items.

At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to CT ratio display
items.

In the figure, CT ratio=5.

(Note: decimals part of ratio are not displayed.)

Example 5:

This screen shows display items of software version number.
At cyclic display mode, press " ▲ " or " ▼ " to enter key
display mode. Press " ▲ " or " ▼ " again to switch to display
items of software version number.

In the figure, "Soft" means software version, "13" means
product specification, "121121" means software version date
and "00" means serial number of software production.

Example 6:

This screen shows device number display items.

At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to device number
display items. Device number=000000000001.

Example 7:

This screen shows fault code display items.

At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to fault code display
items. "E" means fault, the 3 bits from right to left mean re­spectively phase C reverse, phase B reverse, and phase A re­verse. Other 4 bits are meaningless. For example,
"E0000001" means phase C reverse fault occurs.

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Key Setting Parameters

1. Key functions at parameter setting mode

Key symbol ▲▼

Function

1.Press " " once after adjusting parameters with "▲" and "▼" to display "Sure", and press " " once

again to alter parameters. Pressing " " immediately after "Sure" appears will cancel current alteration.

2. Data items configurable with key

NO.

Symbol Definition Symbol Definition Range Remarks

a) Press " " and " " at the same time to enter
setting screen.

a) "▲" to switch digit or flip over;
b) "▼" to move cursor or flip over.

st

level menu 2nd level menu

1

b) Press " " to enter next menu or "confirm" parameter
setting.

c) Press " " to return to previous menu or "cancel" pa­rameter setting

1

.

Operation and Display

4.3 Key Definition

Baud rate 600 ... 38400

Parity

1

Communi-

cation

setting

Modbus address 0 ... 247 Default setting: 0

Modbus sending
delay

DL/T645 high 6
address

DL/T645 low 6
address

Current conversion

2

Ratio

setting

ratio integer part

Current conversion
ratio decimal part

8E1/8o1/8n1/8n

2

0 ... 2999

0 ... 999999 Default setting: 0

0 ... 999999

0 ... 9999

0 ... 9999

Default setting:
2400

Default setting: 8E1

Unit: ms

Default setting: 10

Default setting:
Last 3 digital of S/N

Combination 0 ...

9999.9999

Default setting: 1

3

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System

setting

Connection

Password

3P4L

3P3L_2CT

3P3L_3CT

AUto

3phase4wire

3phase3wire -2CT

3phase3wire -3CT

Automatic

6 bits in total, Set
L0-2 password
Default setting:
000000

19

Operation and Display

4.3 Key Definition

NO.

4

5

st

1

level menu 2nd level menu

Symbol Definition Symbol Definition Range Remarks

Clearing
extreme

value

Display

setting

Time of returning to
cyclic display state
when no operation

Time of backlight
on when no opera­tion (normally on
when set to 0)

1 ... 99

0 ... 99

Unit: min.

Default setting: 10

Unit: min.

Default setting: 10

Interval of cyclic
display

Note

1 ... 99

Unit: sec

Default setting: 5

Password level (1 bit, 0 to 2) and password (6 bits) should be entered at first for key setting. Password level
and permission:

• L0 password-all parameters above are configurable;

• L1 password-all parameters above are configurable;

• L2 password-all parameters except for clearing extreme value and PT/CT conversion ratio are configurable.
All default password is 000000.

3. Parameter setting with keys (take "Conn communication setting" for example)

20

Figure 4-2 Parameter setting with keys

At any time, press " " and " " simultaneously to enter "PASS" screen. The first digit of displayed data
means password level and the remaining 6 data make up the password (press "▲" to change digits and "▼"
to move cursor). Press " " to confirm. "FAIL" will appear if password level and password are wrong. To re­enter password, press " ". To quit and return to cyclic display state, enter " " (if specified error count is

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Operation and Display

4.3 Key Definition

reached, parameter setting function will be locked for certain period which is configurable in advance). If the
password is validated, you may enter the first-level menu. The figure shows the read-write items under "Conn"
menu: baud rate and communication address of RS485 port can be set.

Note

"SURE" screen appears after selecting or inputting parameter and pressing " ". Press " " once
again to activate new parameter. Pressing " " at any time during parameter setting will cancel setting or
return to previous menu.

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Operation and Display

4.3 Key Definition

22

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Installation and Wiring 5

5.1 Overall Dimension 24

5.2 Precautions of Installation 24

5.3 Terminals and Wiring Diagram 25

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23

Installation and Wiring

5.1 Overall Dimension

5.1 Overall Dimension

The figure below shows the overall dimension of this product. Panel cut out size: 92 mm×92 mm

Figure 5-1 Overall Dimension of Instrument

5.2 Precautions of Installation

1. Dry and well ventilated environment far away from thermal source and strong electric (magnetic) field is rec­ommended for installation of this product.

2. Ambient temperature: -25 ℃ to +60 ℃ , humidity: ≤ 95% (no condensation)

3. This product should be firmly mounted to avoid accident arising from vibration.

4. For the reason of convenient installation, maintenance and operation and safety, enough space around this
product should be reserved during installation (especially when one panel for multiple meters).

5. Requirement for electric wiring: Stranded fire-retarded copper wire over 2.5 mm
circuit, 1.5 mm2 stranded fire-retarded copper wire should be used for voltage circuit and power supply circuit,
and 1.0 mm

6. Requirement for electric connection: In voltage input circuit and operating power supply circuit, appropriate
fuses (such as 0.5 A fuse) should be connected and a CT short-circuit box should be provided to prevent
open circuit of CT wiring.

2

Shielded Twisted Pair should be used for RS485 communication.

2

should be used for current

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5.3 Terminals and Wiring Diagram

Definition of Terminals (viewed from rear to front and from left to right)

1. Upper main terminals

V+ V- NC NC R11 R12 R21 R22

Power supply end

Reserved

Note

Reserved

NC means no connection, the same below.

2. Lower main terminals

Relay output 1

Installation and Wiring

5.3 Terminals and Wiring Diagram

Relay output 2

V1 V2 V3 VN I11 I12 I21 I22 I31 I32

Phase A current input

Reserved

Note

Reserved

Reserved

Reserved

Phase A current output

Phase B current input

Phase B current output

Phase C current input

Phase C current output

Main terminals are barrier terminals which can be connected using fork or ring-type lug (no more than 6.5 mm
wide). For cables to be connected to upper and lower main terminals, cold-pressed UT2.5-3 terminal is
recommended before connection. The diagram of connection is below.

Figure 5-2 Connection Diagram of Main Terminal

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Installation and Wiring

5.3 Terminals and Wiring Diagram

3. Middle auxiliary terminal (common)

Note

Auxiliary terminal is pluggable.

Wiring diagram

Wiring diagram of main terminal is showed below. "V+" and "V-" are power supply terminals. This product sup­ports DC/AC input, with input voltage 40 V to 420 V. This product needs no connection to voltage terminals V1,
V2, V3 and Vn.

P+ Q+ COM1 DI1 DI2 DI3 DI4 COM2 A B NC NC

Common binary input terminal

Reserved

Reserved

Reserved

Binary input 1

Binary input 2

Binary input 3

Binary input 4

RS485 +

RS485 -

Reserved

Reserved

26

Figure 5-3 Wiring Diagram of 3 phase

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Installation and Wiring

5.3 Terminals and Wiring Diagram

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Installation and Wiring

5.3 Terminals and Wiring Diagram

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Communication 6

6.1 Use of Communication 30

6.2 Introduction of MODBUS-RTU Communication Protocol 31

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Communication

6.1 Use of Communication

6.1 Use of Communication

RS485 port of this product supports MODBUS-RTU communication protocol. Even parity check is the default
setting for data byte check, namely 8E1 (8-digit data, even parity check, 1 stop bit) format. MODBUS-RTU com­munication protocol can also be configured to odd parity check or no verification, namely 8O1 (8-digit data, odd
parity check, 1 stop bit), 8N1 (8-digit data, no parity check, 1 stop bit), or 8N2 (8-digit data, no parity check, 2
stop bits) format. Baud rate of communication port could any of 600 bps, 1,200 bps, 2,400 bps, 4,800 bps, 9,600
bps, 19,200 bps and 38,400 bps.

RS485 port of this product should be connected using Shield Twisted Pair. When wiring, layout of the entire
network should be considered: length and orientation of communication cable, position of upper computer,
matched resistance at network end-point, communication converter, network scalability, network coverage,
EMI, etc.

Note

1. Wiring should be conducted strictly in accordance with requirement.

2. The power meter requiring no communication temporarily should be connected to RS485 network for easy

diagnosis and test.

3. The shielding layer side of cable connected with upper computer should be reliably earthed (PGND: ground,

cubicle, cabinet, etc.) to avoid two-point or multi-point earthing.

4. Shield Twisted Pair should be used for RS485 bus cable. For two twisted pairs, different colors are recom-

mended, one color for "A" side and another color for "B" side of 485 communication port.

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6.2 Introduction of MODBUS-RTU Communication Protocol

6.2 Introduction of MODBUS-RTU Communication Protocol

6.2.1 Overview

Type of Protocol

This is MODBUS RTU protocol applicable to real-time communication of embedded electric energy meter. This
protocol defines the data exchange between terminal unit (slave) and Master, which is realized in the form of
RTU (remote terminal unit) of MODBUS. Asynchronous master-slave half-duplex communication is used.
Communication is initiated from master and slave responds after receiving request from master.
Communication response time < 0.2 sec.

Physical Layer

• Transmission interface: RS485

• Communication address: 0 to 247

• Baud rate: 600 bps to 38,400 bps

• Communication media: Shield Twisted Pair

Data Link Layer (DLL)

• Transmission manner: asynchronous master-slave half-duplex

Communication

• Data frame format: 1 start bit, 8-digit data, even parity check bit, 1 stop bit

• Data packet format:

Address Function Data CRC

8 bits 8 bits n*8 bits 16 bits

Data packet transmission sequence always uses identical address, function code, data and check code. Each
data packet should be transmitted as a continuous bit stream. When data packet from the master reaches
slave, slave matching the address field in data packet will receive and check the data. If no error, slave will
execute the request in data packet and send the responsive date packet to the master. The data packet sent
back by slave contains slave Address, Function executed, Data generated from function execution and CRC.

• Address

Address is at the beginning of data packet and consists of an 8-bit data which means slave address specified
by the master. Each slave address in the bus is unique. Valid address range is from 0 to 247. After the master
sends data packet, only slave matching the inquire address of the master will respond.

• Function

It describes which function is executed by slave. Definition of all function codes are given below.

Code Definition Function

03 H Read data Read current binary value of one or more variables

10 H Preset multiple registers Overwrite values of several variables using specific binary value

• Data

It contains data required for executing specific function by slave or data acquired when slave responds inquiry
of master. Content of these data may be address code or data.

• CRC

Check code is 16-bit check data formed in data transmission for CRC of master and slave. Various
interferences exist in communication, so data transmitted during communication may change. CRC will avoid
data distortion during responsive transmission of master and slave and improves security and efficiency of
system. For formation rule of check code, see Annex 1.

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Communication

6.2.2 Function of Application Layer

6.2.2 Function of Application Layer

Read Data Command (function code 03 H)

• Request data frame format

Communication
address (0-247)

Function

code

(03 H)

High byte of

start address

of data

• Response data frame format

Communication

address (0-247)

Function

code

(03 H)

Number of

bytes of data

length

• Example

- Request data frame of 3-phase current value

Device address 03 H 10 H 08 H 00 H 03 H Low check High check

- Response data frame

Device address 03 H 06 H Data 1 Data 2 ... Low check High check

Preset Multi-Register Command (function code 10 H)

• Request data frame format

Device

address

0-247

Func-

tion

code

(10 H)

High byte

of start

address

of vari-

able

Low byte

of start

address

of vari-

able

Low byte of

start address

of data

Content of

data

High byte

of vari-

able

number

Content of

Low

byte of
variable
number

High byte

of length

of data

data

Data
byte
numb
er

Low byte of

length of

data

Content of

data

Data

Data

byte

byte

1

Low byte

of CRC

Low byte of

CRC

Data
byte
n

High byte

of CRC

High byte of

CRC

Low

byte of

CRC

High

byte of

CRC

• Response data frame format

Device

address

0-247

Func-

tion

code

(10 H)

High

byte of

start

address

of vari-

able

Low byte

of start

address

of vari-

able

High

byte of
variable
number

Low

byte of
variable
number

Low byte of

CRC

High byte of

CRC

• Example

- Request data frame when CT conversion ratio is 1234.5678 (hexadecimal notation of 12345678: 00BC
614EH)

Device

address

10 H 00 H 05 H 00 H 02 H 04 H 00 H BC H 61 H 4E H Low check High check

- Response data frame

Device address 10 H 00 H 05 H 00 H 02 H Low check High check

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Exception Response

• Exception response frame format

Communication
address (0-247)

• Example

- Address data of illegal register read

Device address 03 H XX H XX H 00 H 01 H Low check High check

- Response frame

Device address 83 H 02 H Low check High check

• Exception code of MODBUS

Code Meaning

02 H Illegal data address

03 H Illegal data

10 H No permission

11 H Register length overflow

Function code

(80 H+03 H)

(80 H+10 H)

Communication

6.2.3 CRC Method

Exception code (XX H) Low byte of CRC High byte of CRC

6.2.3 CRC Method

CRC contains 2 bytes, namely 16-bit binary system. CRC is calculated with transmitting device and placed at
the tail of transmitted message. Receiving device recalculates CRC of message received and compares
whether CRC derived matches the received one. If not, error may occur.

To calculate CRC, preset all 16-bit registers to 1. Then, process each 8-bit data message one by one. Only 8­bit data bit is used for CRC calculation and start bit and stop bit and parity check bit (if any) are not involved.

Steps of calculating CRC:

• Preset 16-bit register to hexadecimal FFFF (namely all to 1), and this register is called CRC register.

• Execute exclusive OR of low bytes of 1

• Shift the content of register rightwards by one bit (towards lower bit) and fill the highest bit with 0. Check the
lowest bit.

• If the lowest bit is 0, repeat step 3 (shift again); if it is 1, execute exclusive OR of CRC register and polynomial
A001 (1010 0000 0000 0001).

• Repeat step 3 and step 4 until shift rightwards 8 times. Now, all 8-bit data are processed.

• Repeat step 2 to step 5 to process next 8-bit data.

• The CRC register derived finally is CRC.

st

8-bit data and 16-bit CRC register and put the result in CRC register.

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Communication

6.2.4 Information mapping table

6.2.4 Information mapping table

Common Parameters

Parameter Address Data Type Length R/W Data Range Remark

Modbus address 0000 H unsigned int 2 bytes R/W 0...247

Baud rate of
communication

16 UBs of current
conversion ratio

16 LBs of current
conversion ratio

Clearing extreme
value

Parity bit 0020 H unsigned int 2 bytes R/W 0...3

0001 H unsigned int 2 bytes R/W 0...6

0004 H

unsigned long 4 bytes R/W 0...99999999

0005 H

0006 H unsigned int 2 bytes W Arbitrary value

0: 2400 bps

1: 4800 bps

2: 9600 bps

3: 19200 bps

4: 38400 bps

5: 600 bps

6: 1200 bps

CT ratio=set val­ue/10,000, 10,000
as default when
CT=0

0: 8E1

1: 8o1

2: 8n1

3: 8n2

Alarm Parameters

Parameter Address Data Type Length R/W

Relay output 1 0100 H unsigned int 2 bytes R/W 0...1

Relay output 2 0101 H unsigned int 2 bytes R/W 0...1

Binary inputs 0102 H unsigned int 2 bytes R

Alarm control
byte

Data

Range

0103 H unsigned int 2 bytes R/W 0...3

Remark

Write operation is valid
when "alarm control
byte" is 0 or 2

Write operation is valid
when "alarm control
byte" is 0 or 1

High byte: Binary input
status (note)

Low byte: Relay output
status

0: turn off alarm function

1: relay output 1 is used
for alarm

2: relay output 2 is used
for alarm

3: relay output 1 and 2
are all used for alarm

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Communication

6.2.4 Information mapping table

Parameter Address Data Type Length R/W

Data

Range

Alarm status byte 0106 H unsigned int 2 bytes R 0...0x3F

BO1 Relay oper­ation time

BO2 Relay oper­ation time

Limit viola­tion data type

0107 H unsigned int 2 bytes R/W

0109 H unsigned int 2 bytes R/W

0110 H unsigned int 2 bytes R/W 0...31 See alarm type table

0 or

100...3000

0 or

100...3000

16 UBs of
limit violation
threshold

16 LBs of
limit violation

0111 H

0112 H

unsigned long 4 bytes R/W

Arbitrary

value

threshold

Alarm 1

Limit viola­tion detection

0113 H unsigned int 2 bytes R/W 0...1 0: over, 1: below

type

Alarm port 0114 H unsigned int 2 bytes R/W 0...3

Alarm 2

Alarm 3

Alarm 4

Alarm 5

Alarm 6

0115 H

...0119 H

011A H

...011E H

011F H

...0123 H

0124 H

...0128 H

0129 H

...012D H

10 bytes R/W See Alarm 1

10 bytes R/W See Alarm 1

10 bytes R/W See Alarm 1

10 bytes R/W See Alarm 1

10 bytes R/W See Alarm 1

Remark

From low to high, each
bit means status of an
alarm group:

0: no alarm activated

1: in alarm status

Unit: ms. Value 0 is for
latched output; value
100~3000 for pulse
output

Unit: ms. Value 0 is for
latched output; value
100~3000 for pulse
output

Threshold=set val­ue/100

0: off

1: alarm output to relay
output 1

2: alarm output to relay
output 2

3: alarm output to relay
output 1 and 2

Note

High bytes BIT0-BIT3 respectively mean status of binary input 1-4. Bit value 0 means input is open while 1
means input is closed.

Low bytes BIT0 and BIT1 respectively mean status of relay output 1 and 2. Bit value 0 means contact is open
(relay no operation) while 1 means contact is closed (relay closed).

Other Parameters

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Communication

6.2.4 Information mapping table

Current Value

Parameter Address Data Type Length R/W

Data

Range

Remark

Cyclic display time 0132 H unsigned int 2 bytes R/W 1...99 Unit: sec

Number of cyclic
display items

st

screen of cyclic

1
display item of

0133 H unsigned int 2 bytes R/W 0...0xFF

0140 H unsigned int 2 bytes R/W 0...999

See description of
cyclic display parame­ters

screen A

Number n screen
of cyclic display
item of screen A

... unsigned int 2 bytes R/W 0...999

See cyclic display code
table of area A

16th screen of
cyclic display item

014F H unsigned int 2 bytes R/W 0...999

of screen A

Parameter Address Data Type Length R/W Data Range Unit

Phase A current 1008 H unsigned int 2 bytes R 0...65535 0.001 A

Phase B current 1009 H unsigned int 2 bytes R 0...65535 0.001 A

Phase C current 100A H unsigned int 2 bytes R 0...65535 0.001 A

Average current 100B H unsigned int 2 bytes R 0...65535 0.001 A

Neutral current 100C H unsigned int 2 bytes R 0...65535 0.001 A

Extreme Va lu e Pa ra meters

Parameter Address Data Type Length R/W Data Range Unit

Phase A current 4X2A unsigned int 0...65535 0.001 A

Phase B current 4X31 unsigned int 0...65535

Phase C current 4X38 unsigned int 0...65535

Neutral current 4X3F unsigned int 0...65535

Note

X-0 means maximum value while X=1 means minimum value.

This manual applies to software version for 150113 and later released by the device.

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Maintenance 7

7.1 Maintenance 38

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Maintenance

7.1 Maintenance

7.1 Maintenance

• Voltage connection should be conducted strictly in accordance with voltage level marked on nameplate.

• Tighten the terminals and hang the meter securely to screen which is strong, refractory and vibration-free
during installation. Upward view of the meter provides the best display effect, so it should be installed verti­cally.

• The meter should be stored in environment free of condensation at -35 ℃ to 70 ℃and ≤ 95% humidity in orig­inal package. At most 5 layers are allowable for stacking. The meter is inappropriate for storing after unpack­ing. The meter should be stored in clean location free of hazardous substances or gas which may cause cor­rosion in air.

• In the operating environment of the meter, lightning protection should be provided.

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Ordering Number 8

8.1 Ordering Number 40

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Ordering Number

8.1 Ordering Number

8.1 Ordering Number

Model: SICAM — P 3
Function

3-phase current, no communication port 0
3-phase current, one RS485 port 1
3-phase current, 4BI 2BO, one RS485 port 2

Model Order No.

SICAM P30 7KG7331-1AA00

SICAM P31 7KG7331-1AA01

SICAM P32 7KG7331-1AA11

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